PERFORCE change 132485 for review

[Peter Grehan]

Hi Rafal,

> 	Temporary fix to avoid confusion of 'kstack0' symbol and make e500
> 	kernel operational again. kstack0 area requires further
> 	improvements (space for kstack0 is now statically defined within
> 	kernel body, does not have guard pages etc., which should be fixed)

  On AIM it is allocated correctly but never switched over. The 
(not-yet-implemented) plan was to mimic amd64 and return the value from 
powerpc_init() to locore, switching r1 to this value before calling 
mi_startup().

later,

Peter.